The rules for Utah and Gold clearly indicate (at least in English language) the exit hexes grant 1 medal for the first unit to exit via that hex. There are no ambiguities in the rules, so play them exactly as written, regardless of whether its a single map or dual map scenario.

The only caveat is that when using dual maps the exiting units from Utah or Gold are not removed from the board, but appear on the Airborne or Omaha maps, respectively, depending on which maps you're playing (e.g., Utah-Airborne or Gold-Omaha).

"Place a Medal on each of the four road hexes on the right side of the board. These are Exit hexes for the Allied forces; however, for each road hex, only the first unit to exit will gain a Medal. The Medal, once gained, is a Permanent Medal and cannot be lost (place it on the Allied Player&#8217;s Victory Track). When the Omaha Beach map is not being used alongside the Gold Beach map, units that exit the map are removed from the game."